airbox for horizontal mina motors with big carbs

[hippo008]

I was digging around Webike Japan and ran into these. They are airboxes made by KN Planning that are designed to fit in the stock airbox location while still accepting large diameter carbs. They sell one with a 50mm intake connection and another with a 42mm connection.

 













At a price of $50 shipped to my door in the USA. What are your thoughts? 

I have one on order for review 

[chadbullet]

I'd rather pay less, but looks promising! Interested to hear your thoughts once you have it in hand.

[hippo008]

Oct 24, 2022 20:30:45 GMT -5 chadbullet said:

I'd rather pay less, but looks promising! Interested to hear your thoughts once you have it in hand.

I figure I'm paying about $25~ for a quality air filter shipped to my home. The quality airboxes ive seen usually start around the $50 price point. So if this airbox is on par in terms of quality with my Polini and UNI pod filters I think I'll be really pleased. I'm really hoping it helps bring noise down too.

[90GTVert]

$50 seems too high for an airbox... but everything is too expensive now and that's making a long trip to your door. If you went for a genuine replacement for a Polaris 90cc Minarelli, they're about $50 shipped and they're just a good quality part with the larger tube from airbox to carb (but still for small carbs). I've modified a couple of airboxes to make them work with larger carbs and those appear to be better designed than what is easy enough to do to standard airboxes. Hope it turns out to be a quality piece. Keep us posted.

[Lucass2T]

Thats exactly what I need!
Can you post the link to the website?

You could also build something similar with self sourced parts.

Lambretta intake hose

[hippo008]

Oct 25, 2022 7:59:36 GMT -5 Lucass2T said:

Thats exactly what I need!
Can you post the link to the website?

You could also build something similar with self sourced parts.

Lambretta intake hose

You will be happy to know I purchased two of them! I planned to sell the other one to help offset the cost of my parts addiction but I'll sell it to you at cost if you want it.

In terms of the Polaris 90 airbox modifications I also planned on doing one of those before I found this product. The airbox (new but not OEM) was $20 off Ebay. I purchased a 50mm to 40mm reducing elbow off the slow-boat from China to try and cram into the airbox inlet, that cost me about $15 shipped. I'll still need some epoxy or shoegoo or something to make the connection between the hose and box. I assume that will be another $15 or so. By my math that puts me at right about the $50 I paid for the KN Planning airbox that's ready made. Of course that doesn't take quality into account but in terms of cost + project time the KN Planning comes out ahead.

[Lucass2T]

Oct 25, 2022 12:35:48 GMT -5 hippo008 said:

Oct 25, 2022 7:59:36 GMT -5 Lucass2T said:

Thats exactly what I need!
Can you post the link to the website?

You could also build something similar with self sourced parts.

You will be happy to know I purchased two of them! I planned to sell the other one to help offset the cost of my parts addiction but I'll sell it to you at cost if you want it.

In terms of the Polaris 90 airbox modifications I also planned on doing one of those before I found this product. The airbox (new but not OEM) was $20 off Ebay. I purchased a 50mm to 40mm reducing elbow off the slow-boat from China to try and cram into the airbox inlet, that cost me about $15 shipped. I'll still need some epoxy or shoegoo or something to make the connection between the hose and box. I assume that will be another $15 or so. By my math that puts me at right about the $50 I paid for the KN Planning airbox that's ready made. Of course that doesn't take quality into account but in terms of cost + project time the KN Planning comes out ahead.

Thanks for the offer but knowing myself i'm gonna fab up something from scratch.
I do love to see a bunch of pics of than KN planning unit mounted on your bike ready to go. It's a nice unit but I have my doubts about fitment.

[hippo008]

Oct 25, 2022 13:39:36 GMT -5 Lucass2T said:

Thanks for the offer but knowing myself i'm gonna fab up something from scratch.
I do love to see a bunch of pics of than KN planning unit mounted on your bike ready to go. It's a nice unit but I have my doubts about fitment.

Heres the link to the KN Planning airbox on Webike Japan. KN Planning also sells some carburetor boots to modify your own airbox. Maybe thats the route to go


japan.webike.net/products/22638379.html

I found the boot the airbox uses. KN Planning sells it here -> 50mm Right Angle Boot

Heres the straight one -> 50mm straight connection

A traditional 90 w/ 50mm connection to modify your OEM Airbox -> 50mm 90 standard

EDIT: I am digging through KN Planning's offerings and they have essentially everything you need to modify your stock airbox to make it work. This is a really great resource, I was having a TON of trouble finding the parts to do a stock conversion. If anyone has seen my other Dio threads I recently was gifted a $160(!) DD50 airbox where the only modification was that one of the $20 KN Planning adapter boots were installed. Live and learn I guess!

[Lucass2T]

Oct 25, 2022 14:42:10 GMT -5 hippo008 said:

Oct 25, 2022 13:39:36 GMT -5 Lucass2T said:

Thanks for the offer but knowing myself i'm gonna fab up something from scratch.
I do love to see a bunch of pics of than KN planning unit mounted on your bike ready to go. It's a nice unit but I have my doubts about fitment.

Heres the link to the KN Planning airbox on Webike Japan. KN Planning also sells some carburetor boots to modify your own airbox. Maybe thats the route to go


japan.webike.net/products/22638379.html

I found the boot the airbox uses. KN Planning sells it here -> 50mm Right Angle Boot

Heres the straight one -> 50mm straight connection

A traditional 90 w/ 50mm connection to modify your OEM Airbox -> 50mm 90 standard

EDIT: I am digging through KN Planning's offerings and they have essentially everything you need to modify your stock airbox to make it work. This is a really great resource, I was having a TON of trouble finding the parts to do a stock conversion. If anyone has seen my other Dio threads I recently was gifted a $160(!) DD50 airbox where the only modification was that one of the $20 KN Planning adapter boots were installed. Live and learn I guess!

Thanks for searching and posting it here!
It's a great resource!

[repherence2]

Oct 25, 2022 12:35:48 GMT -5 hippo008 said:

You will be happy to know I purchased two of them! I planned to sell the other one to help offset the cost of my parts addiction but I'll sell it to you at cost if you want it.

i'll "trade" you the 2 intake boots for one of those air boxes.  let me know.  i picked up the 2 boots you wanted on Saturday, but on my way to 808 Cycle Center, my drive axle bearing broke so i was not able to send out the boots this past weekend.

[hippo008]

Oct 25, 2022 21:53:53 GMT -5 repherence2 said:

Oct 25, 2022 12:35:48 GMT -5 hippo008 said:

You will be happy to know I purchased two of them! I planned to sell the other one to help offset the cost of my parts addiction but I'll sell it to you at cost if you want it.

i'll "trade" you the 2 intake boots for one of those air boxes.  let me know.  i picked up the 2 boots you wanted on Saturday, but on my way to 808 Cycle Center, my drive axle bearing broke so i was not able to send out the boots this past weekend.

I'll take that deal. PM me your address

[hippo008]

An interesting package arrived from Japan, inside were lots of interesting parts and two KN Airboxes.
















The fit and finish is very high. The airbox body is also much larger than an OEM Yamaha airbox. The intake boot fits pretty well. I doubt any dust or debry would find its way in the intake. I may end up sealing it with some glue so no dust gets sucked in there. The airbox comes with these snorkel tubes that get pushed in securely. I'm not sure what it's for but hey they fit well and won't leak. This looks very promising. 

[Lucass2T]

Did you also managed to fit it to the motor? If so, how does it fit? Does it hit any of the fairings?